The old Newmar battery charger on my Hunter 1990 33.5 should be replaced. Not because it doesn't charge, but because it can over-charge. This information provided by the Newmar tech support. I have 12 VDC refrigeration and want to leave it running while in port and unattended. I use a 2-bank battery system with a #24 and #27 flooded deep-discharge wet cells. The Xantrex 20+ is a very popular model, but I believe the 10 amp version is enough for what I have.Anybody have further thoughts on that?